JAVA

instanceof java

@Test
public void givenWhenInstanceIsCorrect_thenReturnTrue() {
    Ring ring = new Ring();
    Assert.assertTrue(ring instanceof Round);
}

Java instanceof in Interface

// Java program to check if an object of a class is also
//  an instance of the interface implemented by the class

interface Animal {
}

class Dog implements Animal {
}
class Main {
  public static void main(String[] args) {

    // create an object of the Dog class
    Dog d1 = new Dog();
    // checks if the object of Dog
    // is also an instance of Animal
    System.out.println(d1 instanceof Animal);  // returns true
  }
}